All vulnerabilities
CVE-2026-55255GHSA-qrpv-q767-xqq2PYSEC-2026-221

Langflow Authorization Bypass Through User-Controlled Key Vulnerability

Langflow LangflowPyPIApplications & CMS
Open in ThreatlineRecord JSON
CVSS
8.4High
ExploitationExploited in the wildAdded to KEV 7 Jul 2026CISA KEV
Exploit odds (EPSS)0.89%Chance of exploitation activity in the next 30 days, higher than 58% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in1.9.1Fixed versionOSV
Federal deadline10 Jul 2026Remediation due date for US federal agenciesCISA KEV
CISA required actionApply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. CISA KEV
Patching is not enoughCISA requires federal agencies to look for signs of compromise on affected systems, not only patch (forensic triage under BOD 26-04). Treat exposed systems as possibly compromised. CISA guidance

What fixes it

  • 1.9.1langflow, PyPIOSVpip install "langflow>=1.9.1"

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Timeline

  1. 23 Jun 2026, 16:28 UTCPublishedCVE List
  2. 7 Jul 2026Added to CISA KEVCISA KEV

Description

Langflow contains an authorization bypass through user-controlled key vulnerability which allows an authenticated attacker to execute any flow belonging to another user by specifying the victim's flow ID in the request.

Text from CVE List

Affected versions 53

  • langflowaffected: < 1.9.1CVE List
  • langflow, pip< 1.9.1GitHub
  • langflow, PyPIfrom first release, fixed in 1.9.1OSV
  • langflow, PyPI0.0.31OSV
  • langflow, PyPI0.0.32OSV
  • langflow, PyPI0.0.33OSV
  • langflow, PyPI0.0.40OSV
  • langflow, PyPI0.0.44OSV
  • langflow, PyPI0.0.45OSV
  • langflow, PyPI0.0.46OSV
  • langflow, PyPI0.0.52OSV
  • langflow, PyPI0.0.53OSV
  • langflow, PyPI0.0.54OSV
  • langflow, PyPI0.0.55OSV
  • langflow, PyPI0.0.56OSV
  • langflow, PyPI0.0.57OSV
  • langflow, PyPI0.0.58OSV
  • langflow, PyPI0.0.61OSV
  • langflow, PyPI0.0.62OSV
  • langflow, PyPI0.0.63OSV
  • langflow, PyPI0.0.64OSV
  • langflow, PyPI0.0.65OSV
  • langflow, PyPI0.0.66OSV
  • langflow, PyPI0.0.67OSV
  • langflow, PyPI0.0.68OSV
  • langflow, PyPI0.0.69OSV
  • langflow, PyPI0.0.70OSV
  • langflow, PyPI0.0.71OSV
  • langflow, PyPI0.0.72OSV
  • langflow, PyPI0.0.73OSV
  • langflow, PyPI0.0.74OSV
  • langflow, PyPI0.0.75OSV
  • langflow, PyPI0.0.76OSV
  • langflow, PyPI0.0.78OSV
  • langflow, PyPI0.0.79OSV
  • langflow, PyPI0.0.80OSV
  • langflow, PyPI0.0.81OSV
  • langflow, PyPI0.0.83OSV
  • langflow, PyPI0.0.84OSV
  • langflow, PyPI0.0.85OSV
  • langflow, PyPI0.0.86OSV
  • langflow, PyPI0.0.87OSV
  • langflow, PyPI0.0.88OSV
  • langflow, PyPI0.0.89OSV
  • langflow, PyPI0.1.0OSV
  • langflow, PyPI0.1.2OSV
  • langflow, PyPI0.1.3OSV
  • langflow, PyPI0.1.4OSV
  • langflow, PyPI0.1.5OSV
  • langflow, PyPI0.1.6OSV
  • langflow, PyPI0.1.7OSV
  • langflow, PyPI0.2.0OSV
  • langflow, PyPI0.2.1OSV

References 6